Simple and accurate analytical model of planar grids and high-impedance surfaces comprising metal strips or patchesThis paper introduces simple analytical formulas for the grid impedance of electrically dense arrays of square patches and for the surface impedance of high-impedance surfaces based on the dense…Olli Luukkonen, Constantin Simovski, Gérard Granet et al.·May 24, 2007SaveLearn
Mesoscopic effective material parameters for thin layers modeled as single and double grids of interacting loaded wiresAs an example of thin composite layers we consider single and double grids of periodically arranged interacting wires loaded with a certain distributed reactive impedance. Currents induced to the…Pekka Ikonen, Elena Saenz, Ramon Gonzalo et al.·May 23, 2007SaveLearn
Magnification of Subwavelength Field Distributions at Microwave Frequencies Using a Wire Medium Slab Operating in the Canalization RegimeMagnification of subwavelength field distributions using a wire medium slab operating in the canalization regime is demonstrated using numerical simulations. The magnifying slab is implemented by…Pekka Ikonen, Pavel Belov, Constantin Simovski et al.·May 22, 2007SaveLearn
Simulation of Single Reed Instruments Oscillations Based on Modal Decomposition of Bore and Reed DynamicsThis paper investigates the sound production in a system made of a bore coupled with a reed valve. Extending previous work (Debut, 2004), the input impedance of the bore is projected on the modes of…Fabrice Silva, Vincent Debut, Jean Kergomard et al.·May 19, 2007SaveLearn
Acoustic response of a rigid frame porous medium slab with a periodic set of inclusionsThe acoustic response of a rigid frame porous slab with a periodic set of inclusions is calculated by use of a multipole method. The acoustic properties, in particular the absorption, of such a…Jean-Philippe Groby, Armand Wirgin, Laurent De Ryck et al.·May 18, 2007SaveLearn
On an identity for the volume integral of the square of a vector fieldA proof is given of the vector identity proposed by Gubarev, Stodolsky and Zakarov that relates the volume integral of the square of a 3-vector field to non-local integrals of the curl and divergence…A. M. Stewart·May 15, 2007SaveLearn
Validity conditions of the direct boundary integral equation for exterior problems of plane elasticityWriting the boundary integral equation for an exterior problem of elasticity is subordinate so far to hypotheses on the asymptotical behaviour at infinity of solutions. The sufficient conditions met…Alain Corfdir, Guy Bonnet·May 15, 2007SaveLearn
Total Differential Errors in Two-Port Network Analyser MeasurementsSince S-parameter measurements without uncertainty cannot claim any credibility, the uncertainties in full two-port Vector Network Analyser (VNA) measurements were estimated using total complex…N. I. Yannopoulou, P. E. Zimourtopoulos·May 6, 2007SaveLearn
Electromagnetic field and radiation for a charge moving along a helical trajectory inside a waveguide with dielectric fillingWe investigate the electromagnetic field generated by a point charge moving along a helical trajectory inside a circular waveguide with conducting walls filled by homogeneous dielectric. The parts…A. S. Kotanjyan, A. A. Saharian·May 3, 2007SaveLearn
Resonant forcing of select degrees of freedom of multidimensional chaotic map dynamicsWe study resonances of multidimensional chaotic map dynamics. We use the calculus of variations to determine the additive forcing function that induces the largest response, that is, the greatest…Vadas Gintautas, Glenn Foster, Alfred W. Hubler·May 2, 2007SaveLearn
New paradox in the special theory of relativity generated by the string dynamicsIt is proved that the definition of simultaneity by Einstein leads to the paradox motion of he string from the viewpoint of the observer in the inertial system S' moving with velocity v with…Miroslav Pardy·May 2, 2007SaveLearn
On capillary-gravity waves generated by a slow moving objectWe investigate theoretically and experimentally the capillary-gravity waves created by a small object moving steadily at the water-air interface along a circular trajectory. It is well established…Alexei Chepelianskii, Frédéric Chevy, Elie Raphael·Apr 30, 2007SaveLearn
A new numerical algorithm for Low Mach number supercritical fluidsA new algorithm has been developed to compute low Mach Numbers supercritical fluid flows. The algorithm is applied using a finite volume method based on the SIMPLER algorithm. Its main advantages are…Jalil Ouazzani, Yves Garrabos·Apr 23, 2007SaveLearn
Yield design for porous media subjected to unconfined flow: construction of approximate pressure fieldsWe consider the stability of a porous medium submitted to a steady-state flow with free-boundary. Assuming some hypotheses, it is possible to implement the kinematic method by using an approximate…Alain Corfdir·Apr 23, 2007SaveLearn
An English translation o Bertrand's theoremA beautiful theorem due to J. L. F. Bertrand concerning the laws of attraction that admit bounded closed orbits for arbitrarily chosen initial conditions is translated from French into English.F. C. Santos, V. Soares, A. C. Tort·Apr 18, 2007SaveLearn
Analogy electromagnetism-acoustics: Validation and application to local impedance active control for sound absorptionAn analogy between electromagnetism and acoustics is presented in 2D. The propagation of sound in presence of absorbing material is modeled using an open boundary microwave package. Validation is…Laurent Nicolas, M. Furstoss, Marie-Annick Galland·Apr 18, 2007SaveLearn
Yield design formulation for porous media subjected to flow, using approximate pressure field. Calcul à la rupture en présence d'un écoulement : formulation cinématique avec un champ de pression approchéYield design formulation for porous media subjected to flow, using approximate pressure field. We attempt here to use the kinematic method of yield design in the case of a porous medium subjected to…Alain Corfdir·Apr 18, 2007SaveLearn
Experimental Results and Analytical Predictions of EHL Film ThicknessIn this work, we consider several types of lubricants - including non-Newtonian fluids - that were studied under various operating conditions leading us to explore a wide range of dimensionless…Chaomleffel Jean Pierre, Dalmaz Gérard, Philippe Vergne·Apr 18, 2007SaveLearn
A study of the size of snow particles in powder snow avalanchesIn this work, we study the size of the particles involved in a powder snow avalanche phenomenon. To determine these sizes, we study all the phenomena the particles have to face before arriving in the…Marie Rastello·Apr 18, 2007SaveLearn
Ordered addition of two Lorentz boosts through spatial and space-time rotationsThe ordered addition of two Lorentz boosts is normally shown to result in a boost by utilizing concepts from group theory and non-Euclidian geometry. We present a method for achieving this addition…Chandru Iyer, G. M. Prabhu·Apr 16, 2007SaveLearn
Adhesion forces due to nano-triboelectrification between similar materialsContact electrification and triboelectrification are well-known in the case of dissimilar materials, however the case of charge exchange during friction between nominally identical insulating…Christelle Guerret-Piecourt, Sandrine Bec, Frédéric Ségault et al.·Apr 16, 2007SaveLearn
Super Low Traction under EHD and Mixed Lubrication RegimesAfter the pioneered experimental works on superlubricity by Martin et al. on MoS2 [1], Hirano et al. on tungsten and silicon [2] and the further confirmation by Dienwiebel et al. on graphite [3],…Philippe Vergne·Apr 13, 2007SaveLearn
A unified shear-thinning treatment of both film thickness and traction in EHDA conclusive demonstration has been provided that the nature of the shear-thinning, that affects both film thickness and traction in EHL contacts, follows the ordinary power-law rule that has been…Scott Bair, Philippe Vergne, Michel Querry·Apr 13, 2007SaveLearn
Film Thickness Changes in EHD Sliding Contacts Lubricated by a Fatty AlcoholThis paper describes the appearance of abnormal film thickness features formed in elastohydrodynamic contacts lubricated by a fatty alcohol. Experiments were conducted by varying the slide to roll…Kazuyuki Yagi, Philippe Vergne·Apr 13, 2007SaveLearn
Retarded electric and magnetic fields of a moving charge: Feynman's derivation of Liénard-Wiechert potentials revisitedRetarded electromagnetic potentials are derived from Maxwell's equations and the Lorenz condition. The difference found between these potentials and the conventional Liénard-Wiechert ones is…J. H. Field·Apr 12, 2007SaveLearn